That reminds me of an old man I met in a pub once. He overheard a couple of people at the bar talking about weight loss, and butted in, saying ‘I managed to lose more than a stone in one night’. He then lifted up his trousers, to show that he had a false leg! ‘Car accident’ he said.

Yes, removing all your spare parts would be a way of losing weight. In fact, removing excess fat (a ‘tummy tuck’) is an operation that some obese people have. Removing organs would be a very silly idea though. You’d regret it if your one kidney failed.

well, technically you would loose weight, but I find hard to think of parts of the body that we don’t need, apart from the appendix (and that is pretty small, so I don’t think you would loose much weight!).
No, definitely I don’t think it would be a good idea, I would much prefer to stick with a healthy diet and physical exercise

But there are very few organs that you don’t need: of the top of my head, I can only think of tonsils and appendix as being organs you can live without. And just losing them wouldn’t make you lose much weight. Probably chopping an arm or a leg off would be more effective – but just as extreme, I don’t recommend it 🙁